Why did Jiraiya not join the hunt for Itachi?
There many reasons why Jiraiya should have joined. First of all he is a sannin, a very powerful ninja with many powerful techniques. He managed to fight Itachi and Kisame by himself. While Kakashi with 2 other jonins were defeated very fast the last time he met Itachi with 100 percent chakra.
Jiraiya most remarkable skill is to find people and gather infomation. Examples of this are that he discovered how that oro cannot switch bodies for another 3 years once it done it with someone . The only people who would know this would be oro, kabuto, or some of his minions.Which is a quite an achievement and to know exactly when oro did the body switch at the end of the Sasuke retrieval arcis amazing . Also he discovered much about Akatsuki which is a small organization. That would make it very difficult to get any infomation but still managed to gather some.
So why is he not part of the hunt for Itachi? He has far more fighting experience then any of people in the teams and is arguably the strongest ninja introduced. He said there was only 2 times where he nearly died which was when tsunade attacked him for peeking and when naruto went 4 tails. Two people who he cares about could be able to to injure near death and not of any of his battles with other shinobi.
So please tell me your opinion about whatever Jiraiya should be part of the hunt for Itachi. To be honest I was disappointed because I was hoping to see Jiraiya battling at his full capacity but hopefully that will come later in the manga